text: There is overwhelming evidence for production of quark–gluon plasma in relativistic heavy ion collisions.
  The important classes of experimental observations are
  * Strangeness production
  * Elliptic flow
  * Jet quenching
  * J/ψ melting
  * Hanbury Brown and Twiss effect and Bose–Einstein correlations
  * Single particle spectra (thermal photons and thermal dileptons)